A&P I Need Help!!!!

so a good buddy of mine just got engaged and are going to have their wedding in nov this year. our other buddy, brian is the one who got me into photography but is going to be in the wedding as they are better friends than me and the groom are so he can't take pics and so Jake, the groom has asked me to. well for those who know my mad skills obviously know that there is no way that i can do this.

they're spending nearly $40k in this wedding and they want me to be the fricken photographer. anyway, he convinces me and says that they really don't care about the quality of the pics, rather that they are just pics in general of the wedding, reception, ceremony, etc.

i really don't want to do this, but for a friend i am willing to. so ot, here is your mission if you so choose to help. what other gear am i going to need in order to prepare for this. i have a 20d, 17-85mm IS lens, 50mm 1.8 lens, and that's about it. i'm obviously going to need a flash and A LOT OF FRICKEN PRACTICE.

please suggest, suggest and do more suggesting. and not taking up on the offer isn't an option because trust me as much as you guys know how much i suck i know it even more and have made him more than aware of it, yet he still wants me to do this.

My normal wedding setup is 2 20D's. One with either a 17-40 F4L or a 28-70 2.8L and the other with a 70-200 2.8L, 2 580EX flashes 4 1GB flash cards and a shitload of batteres. Shoot jpg to reduce post and alternate between custom WB and auto WB depending on indoors or out.

You'll need a lens than can go from reasonably wide to tele if you want to handle the entire wedding with one lens. You can always rent equipment for the day if you don't own it too. You'll also need a decent flash (preferably with a flip frame) or a fast lens for working indoors. Don't shoot the entire wedding on one memory card, just in case there is a problem, swap new cards in periodically.

I shoot a photojournalistic style without posed/group shots, so it's a little more interesting that way. But I only shoot for friends and encourage them to get a regular photographer to get the traditional group stuff. I would suggest you seriously try to get your friend to hire a pro to handle the bulk of the work if this is your first wedding. This is a big event for them, if you don't feel up to it, don't commit.

And practice using your gear before the wedding. Know how to handle your body and flash before you start shooting or you will miss good shots because you are fiddling with buttons.